Text in force at CS27-10: from CS27-10, effective 8 Feb 2023.
(a) Maximum power-off (autorotation). The maximum power-off rotor speed must be established so that it does not exceed 95% of the lesser of –
(1) The maximum design rpm determined under CS 27.309(b); and
(2) The maximum rpm shown during the type tests.
(b) Minimum power-off. The minimum power-off rotor speed must be established so that it is not less than 105% of the greater of:
(1) The minimum shown during the type tests; and
(2) The minimum determined by design substantiation.
(c) Minimum power-on. The minimum power-on rotor speed must be established so that it is:
(1) Not less than the greater of:
(i) The minimum shown during the type tests; and
(ii) The minimum determined by design substantiation; and
(2) Not more than a value determined under CS 27.33(a)(1) and (b)(1).
ED Decision 2023/001/R · Source